From 1204-1261 Constantinople, Thrace and the Turkish coast of the Sea of Marmara were under the Latin Empire of Constantinople, was a feudal Crusader state founded by the leaders of the Fourth Crusade on lands captured from the Byzantine after the siege of Constantinople.It rulers were Baldwin (1204-1205) who was the Count of Hainaut (in the Flanders, present day Belgium, Henry (1206-1216) the son of Baldwin, Peter (1216-1217), the youngest son of Louis VI of France, Yolanda (regent, 1217-1219), the daughter of Baldwin, Robert I (1219-1228), a younger son of Peter, John of Brienne (regent, 1228-1237), the second son of Erard II, count of Brienne (in France) and Baldwin II (1237-1261), a younger son of Yolanda.